1366 - Incorrect integer value: '' for column `creatihu_shop`.`whos_online`.`customer_id` at row 1

insert into whos_online (customer_id, full_name, session_id, ip_address, time_entry, time_last_click, last_page_url) values ('', 'Guest', '97ce5b6d15ea9be964e921df09b44e40', '3.144.113.197', '1714103775', '1714103775', '/product_info.php?info=p320_Selbstklebende-Folie--Window-Grafik.html')

[XT SQL Error]